Whole Topic Checklist

•  Describe the attraction and repulsion between unlike and like poles of permanent magnets and explain the difference between permanent and induced magnets
•  Draw the magnetic field pattern of a bar magnet, showing how field strength and direction are indicated and change from one point to another
•  Explain how the behaviour of a magnetic compass is related to evidence that the core of the Earth must be magnetic
•  Describe how to plot the magnetic field pattern of a magnet using a compass
•  State examples of how the magnetic effect of a current can be demonstrated and explain how a solenoid arrangement can increase the magnetic effect of the current
•  Draw the magnetic field pattern for a straight wire carrying a current and for a solenoid (showing the direction of the field)
•  PHY ONLY: Interpret diagrams of electromagnetic devices in order to explain how they work
•  HT ONLY: State and use Fleming's left-hand rule and explain what the size of the induced force depends on
•  HT ONLY: Calculate the force on a conductor carrying a current at right angles to a magnetic field by applying, but not recalling, the equation: [ F = BIL ]
•  HT ONLY: Explain how rotation is caused in an electric motor
•  PHY & HT ONLY: Explain how a moving-coil loudspeaker and headphones work
•  PHY & HT ONLY: Describe the principles of the generator effect, including the direction of induced current, effects of Lenz’ Law and factors that increase induced p.d.
•  PHY & HT ONLY: Explain how the generator effect is used in an alternator to generate a.c. and in a dynamo to generate d.c.
•  PHY & HT ONLY: Draw/interpret graphs of potential difference generated in the coil against time
•  PHY & HT ONLY: Explain how a moving-coil microphone works
•  PHY & HT ONLY: Explain how the effect of an alternating current in one coil inducing a current in another is used in transformers
•  PHY & HT ONLY: Explain how the ratio of the potential differences across the two coils depends on the ratio of the number of turns on each
•  PHY & HT ONLY: Apply the equation linking the p.d.s and number of turns in the two coils of a transformer to the currents and the power transfer
•  PHY & HT ONLY: Apply but not recalling the equations: [ Vs × Is = Vp × Ip ] and [ vp / vs = np / ns ] for transformers

Quiz